Electrical machine.



F. WERNER. ELECTRICAL MACHINE. APPLICATION FILED APR. ll. IQIS.

1,176,632. Ptented Mar. 21,1916.

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WITNESSES: INVENTOR.

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F. WERNER.

v ELECTRICAL MACHINE.

APPLICATION mzo APR. lz. I915.

1,176,632. Patented Mar. 21,1916.

3 SHEETSSHEET 2.

Fig-3' INVENTOR.

F- WERNER fWA /Ar RTT YS F. WERNER.

ELECTRICAL MACHINE.

APPLICATION men APLIZ. 1915.

1,176,632. Patented Mar. 21,1916.

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UNITED STATES PATENT OFFICE.

FRI'IHJOF WERNER, OF HAMILTON Q ONTARIO, CANADA.

ELECTRICAL MACHINE.

Specification of Letters Patent. Patented Mar. 21, 1916.

Application filed April 17, 1915. Serial No. 22,058. )7

7 '0 all whom it may concern:

Be it known that I, FRITHJOF WERNER, of the city of Hamilton, in the county of Wentworth, Province of Ontario, Dominion of Canada, have invented certain new and useful Improvements in Electrical Machines, of which the following is a specification.

My invention relates to improvements in,

'structed and arranged as-hereinafter more particularly described and illustrated in the accompanying drawings in which Figure 1 shows a plan view of a dish spring switch constructed according to my invention. Fig. 2 shows a sectionaleleva tion of Fig. 1 on the line .a,a, the switch being shown in its two positions. Fig. 3 is a sectional elevation of Fig. 4 on the line dd, showing the collector in the short circuited position in the case of a 3- base machine. Fig. 4 is a sectional plan 0 Fig. 3 on the line 6-1). Fig. 5 is a sectional elevation of Fig. 4 on the line d-d, showing the collector in the open position.

Like characters of reference indicate corresponding parts in the different views.

1 is a dish spring switch.

2 is the rotor shaft.

3 is a bushing keyed to the shaft 2 by means of the key 4:. J

5 are the collector rings carried by the bushing 3 and insulated therefrom and from each other by the insulating material 6.

1 are dish spring switches held between the collector rings as shown in Figs. 3 and 5.

7 is a nut threaded on to the bushing 3 and adapted to hold the switches and collector rings in place.

8 are insulated rods for connecting the collector rings to the rotor leads.

9 is a shifting collar having sliding engagement on the shaft2 and being held from rotating relatively to theshaft 2 by means of the key 4.

10 are shifting rods having a reduced portion at each end, one end of the rods 10 is held firmly inthe shifting collar 9 by means of the nut 11 the other end has sliding engagement in the bushing 3 as shown at 12. These rods carry the hard fiber shifting blocks 13 securely fastened thereto by the sunk rivets 14.

15 are slots in the blocks 13 which are adapted to engage the dish spring switches 1.

The dish spring switch is punched, or otherwise cut out from a thin hard rolled metal plate of which Fig. 1 shows a plan View, it

is then dished up and the outer-edges rounded off to the shape shown in full lines in Fig.

2. It will readily be seen that this dish spring switch will have two positions of natural equilibrium, viz: that shown in full lines and that shown in dotted lines in Fig. 2.

The operation of my device is as follows: Since it is necessary when starting the motor to have a resistance in series with the rotor, before starting the motor the collar 9 is moved to the left. This puts the collector into the open circuited position as shown in Fig. 5. When the motoris started the current passes along the insulated rods 8, to the collector rings 5 then through the brushes (not shown in the drawings) to the resistance. As the motor speeds up the resistance is graduallycut out until at full load speed the resistance is completely out out. The collar 9 is then moved to the right which puts the dish spring switches into their second position of natural equilibrium in which they bear against the collector rings 5 as shown in Fig. 3 in which it will'be seen that the collector is completely short circuited since the collector rings are all put into conducting communication with each other.

- It will thus be seen that I have devised a very simple and effective means by which the collector rings may be short circuited and way around each collector ring.

Many modifications may be made in my invention without departing from the spirit positive and natural equilibrium, in which positions they respectively short circuit and open the collector circuit and means for controlling the movement of the dish springs.

2. In a collector type induction motor,

. collector rings, a plurality of dish springs suitably mounted between adjacent collector rings so as to be in conducting communica tion with one ring but to be insulated from the other ring, the dish springs being adapted to assume either of two positions of positive and natural equilibrium in which positions they respectively short circuit and open the collector ring circuit and means for controlling the movement of the dish springs. 5

3. In a collector type induction motor, collector rings, a plurality of dish springs, each having a central aperture thereln, and being rigidly mounted on the collector shaft between adjacent collector rings, each spring being so secured that it is in conducting communication with one collector ring and springs being adapted to assume either of two positions of positive and natural equilibrium in which positions they respectively short-circuit and open the collector ring cir- ,cuit, and means for controlling the movement of the dish springs. 1

4. In a collector type induction motor the combination of collector rings, dish springs suitably mounted between the rings and means adapted to move the springs into such positions as to respectively short circuit or open the collector ring circuit.

5. In a collector type induction motor collector rings a dish spring, having a central aperture therein and rigidly mounted on the collector shaft between the collector rings so as to be in conducting communication with one ring but to be insulated from the other ring, the dish spring being adapted to assume either of tWo positions of positive and natural equilibrium in which positions it respectively short circuits or opens the collector ring circuit and means for controlling the movement of the dish s ring.

FRITHJ OF ERNER. Witnesses:

JOHN G. HAYWARD, Q. -E. Tnusoo'r'r.

f insulated from the adjacent ring, the dish 7 

